He was seen on CCTV footage at a service station in Clyde St at 1.30am on Sunday wearing only black shorts.

He was also seen in Galloway St at 10pm on Saturday and swimming in the river under Victoria Bridge at 4am on Sunday.

Mr Sheppard said Mr Arber's parents were grateful to the people of Hamilton, police and media for helping with the investigation.

They thought their son would have appreciated the river's natural beauty, Mr Sheppard said. "Obviously they're terribly upset about it, but Mr Arber and Mrs Arber, they just thought that the location where everything was found, as morbid as it might sound, they just thought he couldn't have wished for anywhere more beautiful. "In the worst possible outcome, they felt as happy as they could possibly be."